WO1995034993A1 - Procede de transmission de pages de teletexte - Google Patents

Procede de transmission de pages de teletexte Download PDF

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Publication number
WO1995034993A1
WO1995034993A1 PCT/IB1994/000394 IB9400394W WO9534993A1 WO 1995034993 A1 WO1995034993 A1 WO 1995034993A1 IB 9400394 W IB9400394 W IB 9400394W WO 9534993 A1 WO9534993 A1 WO 9534993A1
Authority
WO
WIPO (PCT)
Prior art keywords
display format
extension
page
level
code
Prior art date
Application number
PCT/IB1994/000394
Other languages
English (en)
Inventor
Henricus Antonius Wilhelmus Van Gestel
Original Assignee
Philips Electronics N.V.
Philips Norden Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronics N.V., Philips Norden Ab filed Critical Philips Electronics N.V.
Priority to JP50635096A priority Critical patent/JP3652375B2/ja
Priority to EP95900899A priority patent/EP0714584B1/fr
Priority to AU10337/95A priority patent/AU688422B2/en
Priority to BR9407327A priority patent/BR9407327A/pt
Priority to DE69424292T priority patent/DE69424292T2/de
Publication of WO1995034993A1 publication Critical patent/WO1995034993A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0884—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of additional display-information, e.g. menu for programme or channel selection

Definitions

  • a station transmitting Level 3 pages wants to mark a given word in a page by displaying it in bold type.
  • a Level 2 decoder is not provided with this facility. The station therefore desires the relevant word to be displayed in a different colour by Level 2 decoders. To achieve this, the station transmits a Level 2 extension signal for defining the different colour. Moreover, a Level 3 extension signal is transmitted for activating an attribute "bold". The latter signal is ignored by a Level 2 decoder so that it indeed displays the different colour. However, the Level 3 decoder decodes both the extension signal for defming the colour and the extension signal for displaying the word in bold type. Consequently, the Level 3 decoder displays the relevant word in both bold type and in the different colour, which was not the station's intention.
  • the method is therefore characterized in that a code indicating the display format to which the extension signal relates is added to the extension signal.
  • a code indicating the display format to which the extension signal relates is added to the extension signal.
  • the desired compatibility is now achieved by adding a code to the extension signal for defining the different colour, which code indicates that the signal relates to Level 2 only and by adding a code to the extension signal for display in bold type, which code indicates that this signal relates to Level 3 only.
  • the Level 3 decoder now ignores the extension signal for defining the different colour and displays the word in bold type.
  • Fig. 2 shows some examples of data packets which are transmitted by a transmission station shown in Fig. 1.
  • the teletext signal comprises for each transmitted teletext page a plurality of data packets which are accommodated in further known manner in picture lines of the video signal during the field retrace period.
  • Fig. 2 shows some possible forms of these data packets in greater detail.
  • each data packet comprises 45 bytes of 8 bits each.
  • the first 2 bytes having a fixed value 1010..10 are referred to as "clock run-in” and are denoted by CRI in the Figure.
  • the third byte is referred to as the "framing code" F and also has a fixed value.
  • the next 2 bytes comprise a 3-bit magazine number M and a 5-bit row number R.
  • the significance of the other 40 bytes is dependent on the value of the row number R. If the row number R has one of the values 1- 25, as assumed in Fig. 2B, then the 40 bytes constitute a text row of 40 characters for display on a display screen in the Level 1 display format.
  • the transmission of a teletext page starts with, and implies, the header of this page and subsequently comprises the relevant text rows and extension packets.
  • the page number is constituted by the magazine number M, tens T and units U. If is a 3-digit number and is generally within the range between 100 and 899 in order that the user can select it by means of a decimal keyboard.
  • a series of teletext pages is transmitted in a repetitive cycle.
  • Fig. 3 shows a teletext page 32 in Level 2 format.
  • the shaded area in this Figure shows that a word ABCDE has a different background colour.
  • Fig. 3 shows the same teletext page 33 in Level 3 format. In this page the word ABCDE is displayed in bold type without the different background colour.
  • Fig. 4 shows the sequence of data packets transmitted for this page.
  • the sequence comprises a header 400 with which the transmission of page 123 starts, a plurality of data packets 401-425 for forming the page in Level 1 format.
  • data packet 412 is the data packet for row 12 which comprises the word ABCDE at character positions 21-25.
  • the extension packet 426 comprises two extension signals in the form of series of triplets 42, 43.
  • the first series 42 comprises the instructions for def ⁇ iing the background colour in row 12, positions 21-25.
  • the second series 43 comprises the instructions for bold print of the characters in row 12, positions 21-25. Since the different colour or the bold print in this example are the only enhancements of the page, the rest of the extension packet is empty and there will be no further extension packets.
  • the first series of triplets starts with a triplet 421.
  • the second series of triplets starts with a triplet 431.
  • These first triplets of a series comprise a code c.
  • This code may be formed, for example by two bits which indicate whether the relevant series of triplets is intended for Level 2 or Level 3 decoders. If both bits have the value 1, the series of triplets is intended for both Level 2 and Level 3 decoders.
  • Level 1 page is subjected to a plurality of enhancements.
  • enhancements are a plurality of "Level 2 only” enhancements, a plurality of “Level 3 only” enhancements and a plurality of Level 2 enhancements which must also be performed by a Level 3 decoder (for example, both a different colour and bold type).
  • the extension signals are grouped and each group is provided with a start mark (and if desired, with an end mark). The code is accommodated in the start mark.
  • Fig. 5 shows a second example of a sequence of extension packets 526.
  • the data packets having row number 0-25 are equal to the data packets 401-425 in Fig. 4 and therefore they are not shown.
  • the sequence of extension packets comprises a first group of extension signals E2. This group is preceded by a start mark 50 which comprises the code "10" (Level 2 only). Subsequently, there is a group of extension signals E3 which is preceded by a start mark 51 comprising the code "01" (Level 3). Finally, there is a group of extension signals E23 which is preceded by a start mark 52 comprising the code "11" (both Level 2 and Level 3).
  • Fig. 6 shows in greater detail the teletext decoder which is denoted by 33 in Fig. 1.
  • the decoder comprises a data slicer 61 for regaining the data packets from the video signal CVBS, an acquisition circuit 62 for selecting the data packets of a desired page, a memory 63 for storing the selected data packets and a character generator 64 for displaying a page.
  • the decoder further comprises a microprocessor 65. Said microprocessor may read and write the memory 63 via a communication bus 66. Particularly, the microprocessor may read and process received data packets and write the result of the processing operation into the memory for display by the character generator.
  • a step 73 it is subsequently ascertained whether the read triplet is of a type which comprises the 2-bit code c. If this is the case, the control programme checks in a step 74 whether the 2-bit code has the value "xl" (x stands for don't care). If this is the case, the subsequent triplets constitute an extension signal for enhancing the page to Level 3 format which can and must be performed by this decoder. The control programme stores this information by giving a parameter DO a value "Y" in a step 75. If the code c does not have the value "xl", then the subsequent series of triplets relates to an enhancement which must not be performed by the decoder. The control programme stores this information by giving the parameter DO the value 'N' in a step 76.
  • the control programme ascertains in a step 77 whether the parameter DO has the value 'Y'. If this is the case, the current triplet is decoded in a step 78 and further processed for enhancing the page. If this is not the case, the current triplet is ignored.
  • the extension signals with code "01" and “11” are interpreted in this way and the extension signals with code " 10" are ignored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Television Systems (AREA)

Abstract

Procédé de transmission de pages de télétexte dans lequel des signaux relatifs aux extensions sont transmis pour amener les pages de niveau 1 à des niveaux de présentation plus élevés par adjonction au signal relatif à l'extension d'un code indiquant le niveau plus élevé. Un décodeur de niveau 3 peut p. ex. recevoir des instructions l'empêchant de décoder les extensions explicatives destinées aux décodeurs de niveau 2.
PCT/IB1994/000394 1994-06-16 1994-12-05 Procede de transmission de pages de teletexte WO1995034993A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP50635096A JP3652375B2 (ja) 1994-06-16 1994-12-05 テレテキスト頁を伝送する方法
EP95900899A EP0714584B1 (fr) 1994-06-16 1994-12-05 Procede et dispositif de transmission de pages de teletexte
AU10337/95A AU688422B2 (en) 1994-06-16 1994-12-05 Method of transmitting teletext pages
BR9407327A BR9407327A (pt) 1994-06-16 1994-12-05 Processo e estação de transmissão para transmitir páginas de teletexto e receptor e sinal de teletexto
DE69424292T DE69424292T2 (de) 1994-06-16 1994-12-05 Verfahren und vorrichtung zur übertragung von videotextseiten

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94201730.2 1994-06-16
EP94201730 1994-06-16

Publications (1)

Publication Number Publication Date
WO1995034993A1 true WO1995034993A1 (fr) 1995-12-21

Family

ID=8216960

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1994/000394 WO1995034993A1 (fr) 1994-06-16 1994-12-05 Procede de transmission de pages de teletexte

Country Status (9)

Country Link
US (1) US5565927A (fr)
EP (1) EP0714584B1 (fr)
JP (1) JP3652375B2 (fr)
KR (1) KR100381319B1 (fr)
AU (1) AU688422B2 (fr)
BR (1) BR9407327A (fr)
DE (1) DE69424292T2 (fr)
ES (1) ES2149954T3 (fr)
WO (1) WO1995034993A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012485A1 (fr) * 1995-09-25 1997-04-03 Philips Electronics N.V. Procede et dispositif permettant d'envoyer et de recevoir des pages de teletexte
WO2001072038A2 (fr) * 2000-03-21 2001-09-27 Koninklijke Philips Electronics N.V. Procede et dispositif de prestation de services d'informations par radio
JP2003501900A (ja) * 1999-05-28 2003-01-14 インテル コーポレイション レイヤー内のエンハンスメントデータの通信
US8788693B2 (en) 2007-02-16 2014-07-22 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Apparatus and method for generating a data stream and apparatus and method for reading a data stream

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1146240C (zh) * 1997-07-25 2004-04-14 皇家菲利浦电子有限公司 向接收机发送操作信号和处理该操作信号的方法和设备
FR2796798B1 (fr) * 1999-07-19 2001-09-14 St Microelectronics Sa Procede d'affichage d'en-tetes teletexte
US8306064B2 (en) * 2009-01-12 2012-11-06 Trane International Inc. System and method for extending communication protocols

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146878A (en) * 1983-09-21 1985-04-24 Philips Electronic Associated Teletext television receiver with multi-page memory
WO1990013970A1 (fr) * 1989-05-03 1990-11-15 Telefunken Fernseh Und Rundfunk Gmbh Procede et dispositif pour transmettre des donnees de teletexte

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2062424B (en) * 1979-10-31 1983-04-07 British Broadcasting Corp Bradcast teletext system
GB2149627B (en) * 1983-10-26 1987-06-10 Philips Electronic Associated Teletext television receiver with multi-language display
US4890321A (en) * 1986-07-08 1989-12-26 Scientific Atlanta, Inc. Communications format for a subscription television system permitting transmission of individual text messages to subscribers
GB2207329A (en) * 1987-07-17 1989-01-25 Philips Electronic Associated Teletext decoders
DE3856057T2 (de) * 1987-07-20 1998-10-29 Philips Electronics Nv Fernseh-Übertragungssystem
DE68925066T2 (de) * 1988-05-27 1996-07-25 Philips Electronics Nv Teletext-Dekodierer
DE68927576T2 (de) * 1988-05-27 1997-06-12 Philips Electronics Nv Teletext-Dekodierer
JPH02228186A (ja) * 1989-02-28 1990-09-11 Toshiba Corp 文字情報表示装置
NL8901724A (nl) * 1989-07-06 1991-02-01 Philips Nv Teletext decoder en ontvanger van televisie signalen voor het ontvangen van cyclisch uitgezonden teletext pagina's.
DE4028942A1 (de) * 1990-09-12 1992-03-19 Texas Instruments Deutschland Anordnung zum verarbeiten von teletext-informationen
DE59209375D1 (de) * 1991-08-01 1998-07-16 Thomson Consumer Electronics Verfahren zum übertragen von daten in fernsehzeilen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146878A (en) * 1983-09-21 1985-04-24 Philips Electronic Associated Teletext television receiver with multi-page memory
WO1990013970A1 (fr) * 1989-05-03 1990-11-15 Telefunken Fernseh Und Rundfunk Gmbh Procede et dispositif pour transmettre des donnees de teletexte

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012485A1 (fr) * 1995-09-25 1997-04-03 Philips Electronics N.V. Procede et dispositif permettant d'envoyer et de recevoir des pages de teletexte
JP2003501900A (ja) * 1999-05-28 2003-01-14 インテル コーポレイション レイヤー内のエンハンスメントデータの通信
WO2001072038A2 (fr) * 2000-03-21 2001-09-27 Koninklijke Philips Electronics N.V. Procede et dispositif de prestation de services d'informations par radio
WO2001072038A3 (fr) * 2000-03-21 2002-04-18 Koninkl Philips Electronics Nv Procede et dispositif de prestation de services d'informations par radio
US8788693B2 (en) 2007-02-16 2014-07-22 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Apparatus and method for generating a data stream and apparatus and method for reading a data stream

Also Published As

Publication number Publication date
EP0714584B1 (fr) 2000-05-03
JP3652375B2 (ja) 2005-05-25
AU688422B2 (en) 1998-03-12
JP2001520811A (ja) 2001-10-30
EP0714584A1 (fr) 1996-06-05
ES2149954T3 (es) 2000-11-16
AU1033795A (en) 1996-01-05
US5565927A (en) 1996-10-15
DE69424292D1 (de) 2000-06-08
DE69424292T2 (de) 2000-11-30
KR960704431A (ko) 1996-08-31
KR100381319B1 (ko) 2003-10-22
BR9407327A (pt) 1996-06-18

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